Adding-machine



(No Model.) 2 Sheets-Sheet 1.

F. WENDT. ADDING MACHINE.

No. 563,435. Patented July '7, 1896.

Iullllllllllilllllllnl- (No Model.) 2 Sheets-Sheet 2.

F. WENDT. ADDING MACHINE.

No. 563,435. Patented July 7, 1896.

' 17 red Mari,

UNITED STATES PATENT OFFICE.

FRED VENDT, OF MARSHFIELD, IVISCONSIN, ASSIGNOR TO MATHIAS NICK AND JACOB NICK, OF TOMAHAVK, IVISCONSIN.-

ADDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 563,435, dated July 7, 1896. Application led December 3l, 1895. Serial No. 578,917. (No'model.)

To @ZZ whom, it may concern.-

Be it known that I, FRED VENDT, a citizen of the United States, residing at Marshfield,in the county of foods and State of Visconsin,

have invented a new and useful Calculating or Adding Machine, of which the following is a specification.

My invention relates to calculating or adding machines, and has for its object to pro- Io vide a simple, inexpensive, and efficient construction and arrangement of parts whereby numerals may be added in rapid succession through the proper manipulation of keys provided for the purpose, the sums not exceed- I 5 ing one hundred being indicated upon a units- .dial, while the sums exceeding one hundred are indicated upon a hundreds-dial, which is actuated by means connected with the unitsdial to register the hundreds successively as zo they are indicated upon the units-dial.

Further objects and advantages of this invention will appear in the following description, and the novel features thereof will be particularly pointed out in the appended claims.

In the drawings, Figure l is a perspective view of an adding-machine constructed in accordance with my invention. Fig. 2 is a longitudinal central section of the same. Fig. 3 is a transverse section in the plane of the axis of the units-dial. Fig. 4 is a plan view of the operatingmechanism, the casing being shown with the top removed. Fig. 5 is a detail view in perspective of the stop-pawl and 3 5 the rock-shaft, by which it is carried. Fig. G is a detail view in perspective of one of the operating-pawls. Fig. 7 is a partial vertical section on the plane indicated bythe line 7 7 of Fig. a. Fig. S is a detail view of the means for communicating motion from the rocking lever to the spindle of the pointer which traverses the hundreds-dial. Fig. 9 is a detail view of a slightly-modified form of bell-crank lever.

Similar numerals of reference indicate corresponding parts in all the figures of the drawings.

l designates a case within which is mounted the horizontal transverse main shaft 2, carrying a spur-gear 3, having a broad transof the operator.

versely ribbed. or toothed operating-face. Upon one extremity of this main shaft and contiguous to the outer surface of one side of the case is a units-dial 4, preferably provided with an upstanding flange 5, which is graduated from l to 100, and which operates contiguous to a stationary pointer 6, secured to the side of the case. This dial is preferably provided with a knob or handle 7 whereby the main shaft and gear may be 6o turned with the units-dial to its initial position.

A step-by-step motion is communicated to the gear by means of operating-pawls 9, pivotally connected to the upright arms of the 6 5 bell-crank levers l0, the forwardly-extending arms of said levers being attached to the extremities of return-springs ll, whereby when released the operating-pawls are returned to their normal or initial positions. The teeth 7o on the gear are preferably abrupt or parallel sided, and in order to provide for the operating-pawls slipping loosely over the teeth during their backward or return movement the detents 9a of said pawls are beveled at their 75 rear sides. Motion may be communicated to either of the bell-crank levers by means of key-levers l2, which are pivoted within the case preferably below the plane of the main shaft, and are connected to the forwardly- 8o extending arms of the bell-crank levers by means of draw wires or rods I3, the keys la. at the front ends of said key-levers being exposed at the front of the case within reach The keys are inscribed with 8 5 numerals to indicate the number of steps which the units-dial will be advanced in consequence of the operation of said keys, respectively, and in the drawings I have illustrated a series of live keys inscribed consecu- 9o tively from l to 5. The gear which the operating-pawls engage may be and preferably is provided with a number of teeth or ribs corresponding with the number of units inscribed upon the units-dial, and hence in the 9 5 construction illustrated said gear is provided with one hundred ribs or teeth. The bellcrank levers are preferably mounted upon a common fixed spindle l5, and are provided with hubs 16 to fit upon said spindle. 10o

operating-gear, and preferably weighted at the other end to normally hold the nose of the pawl out of engagement with said ribs or teeth, and a rock-shaft by which said pawl is carried, the rock-shaft being mounted at its extremities in suitable bearings on the side walls of the case. This rock-shaft is provided with a depending web or wing 1S,

arranged in the path of shoulders or projections 19, carried, respectively, by the operating-pawls. As the keys are successively operated and the operating-pawls are advanced to communicate motion to the operating-gear, said shoulders or projections on the operating-pawls strike the web or win g of the rockshaft and thus throw the stop-pawl down into operative relation with the ribs or teeth of the gear. As the stop-pawl reaches the operative position it checks the movement of the gear, and by arranging the shoulders or projections at different distances from the plane of the web or wing of the rock-shaft the stop-pawl will be operated at dierent points in the throw of the operating-pawls to suit the denomination of the key depressed.

In order to disengage the operating-pawls simultaneously from the gear to provide for returning the mechanism to its initial position, I employ a trip-rod 20, having eccentric trunnions 2l, mounted in bearings in the side walls of the case, said trip-rod extending transversely under the operating-pawls,and a triplever 22, projecting at its front end beyond the front of the case and arranged at its rear end in operative relation with the trip-rod, as shown in Figs. 4 and 7.

In order to stop the backward rotation of the gear when it reaches the initial point of the mechanism, or when the fixed pointer indicates the terminal numeral on the hundredsdial, I employ a stud 23 on the main shaft, i

Arranged, preferably, upon the front of the casein an exposed position is a hundredsdial 25, traversed by a pointer 26, which is carried by a spindle 27. Afxed to this spindle within the case is a gear 28, with which cooperates a sliding feed-pawl 29, arranged at one end in the path of one end of the rocking lever 30. In the construction illustrated, this feed-pawl is slotted at one end, as shown at 3l, to form a loose or sliding pivot, and a limiting-keeper 32 is arranged at an intermediate point to limit the oscillatory movement of the pawl. The rocking lever receives motion by means of a pin 33 on the main shaft, and said lever is actuated once for each complete revolution of the operating-gear. The movement imparted to the rocking lever at the end of each complete revolution of the operating-gear causes through the feed-pawl a motion of the pointer from one numeral to the next in the hundreds-dial.

In Fig. 9 I have shown a slightly-modified form of stop device for limiting the forward movement of the rotary member or operatinggear, the same consisting of a tooth or detent Si, carried by the bellcrank lever. This form of stop device is of special importance in connection with those operating pawls which are of high denomination, inasmuch as it is positive in its action and is not affected by the extent or amplitude of vibration of the operating-pawl. Furthermore, in orderto prevent lateral vibration of the operating-parvis I preferably provide the lower or free edge of the web or wing of the rockshaft with a series of notches 35, in which iit the shanks of said operating-pawls.

It will be understood that in practice various changes in the form, proportion, and the minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of this invention.

Having described my invention, what I claim is l. In a calculating-machine, the combination of a gear, indicating devices coperatively connected with said gear, reciprocatory operating-pawls normally arranged in operative relation with the gear, a stop-pawl normally held out of engagement with the gear, a rock-shaft connected to the stop-pawl and having a web or wing arranged transversely in the path of projections on the operatingpawls and adapted to be engaged thereby to move the stop-pawl into engagement with the gear, and means for communicating motion to the operating-pawls, substantially as specified.

2. In a calculating-machine, the combination of a gear, indicating devices operatively connected with said gear, reciprocatory operating-pawls normally held by gravity in operative relation with the teeth at the upper side of the gear, a stop-pawl normally held by gravity out of engagement with the gear, a rock-shaft carrying the stop-pawl and having a web or wing arranged in the path of proj ections on the operating-pawls, and means for communicating motion to the operatingpawls, substantially as specified.

3. In a calculating-machine, the combination with a gear and indicating devices operatively connected with said gear, of operatingpawls provided with shoulders or projections, a rock-shaft having a web or wing arranged in the path of said shoulders or projections, a stop-pawl carried by the rock-shaft and normally held out of engagement with the teeth of the gear, the web or wing being provided IOO IIO

'with notches in which operate the shanks of the operating-pawls, and means for communicating motion to the operating-pawls, substantially as specified.

4L. In a calculating-machine, the combination With a gear and indicating devices operatively connected with said gear, of operatingpawls, means actuated by the operatingpaWls for limiting the rotary movement of the gear and means for communicating motion to the operating-parvis, a trip-rod extending transversely under the operating-pawls and having eccentric trunnions, and a trip-lever arranged in operative relation with the triprod, substantially as speciied.

5. In a calculating-machine, the combination With a rotary member and means for com- 

